DE102008009889A1 - Process for coloring a printing form in a processing machine - Google Patents

Abstract

The invention relates to a method for coloring a printing form in a processing machine for substrates. The invention is based on the object to provide a method which allows in particular a stable color guide in a universally applicable inking and noticeably reduces the tendency for stenciling. This is achieved by the fact that in a processing machine for substrates, with an inking unit and optionally a dampening unit and a printing plate having plate / forme cylinder, wherein the inking unit comprises a Farbdosier- and Farbzuführeinrichtung, at least one compactor and inking rollers for inking the printing form and the Color flow of a distributor roller is supplied to the ink flow at the distributor roller 8 in addition to a second direction in the direction of rotation of the plate / forme cylinder 1 third Teilwalzenzug 13 third Teilwalzenzug 21 is divided and the third partial color flow of the third Teilwalzenzuges 21 the second partial ink flow of the second Teilwalzenzuges 13 before Ink application rollers 3, 4, 5 is supplied.

Description

The The invention relates to a process for coloring a printing form in a processing machine for substrates after the Upper part of the independent claim.

Out EP 0 280 957 A2 is an inking unit for a printing unit in an offset printing machine known. The printing unit comprises a plate cylinder having a printing plate, wherein a dampening unit can be assigned to the plate cylinder. The inking unit comprises a distributor roller arranged in the roller train for the ink feed and two sub-roller trains arranged in parallel downstream of this distributor roller. The ink stream is divided from the distributor roller by means of two partial roller trains in two partial color streams and the two partial color streams are fed to a front in the direction of rotation of the plate / forme inking roller for coloring the printing plate.

A method and a device for color guidance are out DE 102 48 517 A1 or off EP 0 741 024 A2 known. Thereafter, an inking roller train comprises a distributor roller and two sub-roller trains arranged in parallel downstream of said distributor roller, each of which has at least one inking roller in contact with a printing plate. The partial rolling trains can be separated at at least one nip so that temporarily the ink stream can be supplied to at least one of the inking rollers via the first or the second partial drawing train. Such color flow separations can prevent a change in the ink layer thickness profile in ongoing inking at printing interruptions. After elimination of the print interruption, the rollers are re-set together at the start of printing, so that the original color flow is restored.

Of the Invention is based on the object, a method of the initially to create the type mentioned, in particular a stable color guide allowed in a universally applicable inking unit and the inclination noticeably reduced for stenciling.

Solved The object is achieved by the training features of claim 1. Further developments result from the dependent claims.

generally known The stenciling is an error symptom when printing in which a structure of the printing form - offset in the printing direction - a or multiple times in addition.

One first advantage of the solution according to the invention This is why, especially in difficult printing forms and / or special printing inks, such as metal paints or strong dampening solution absorbing colors, these irregularities in the Dyeing a printing form avoided or at least noticeable be reduced.

One second advantage is that starting from an arranged in the roller train of an inking unit distributor roller the color flow in the printing operation or the planned color flow already before the start of printing (machine downtime) is specifically influenced. For this purpose, in the inking unit fed in the direction of printing form Amount of color (color flow) in variable color flow components to the respective inking rollers are supplied. So are Color flow shares can be realized in different ways the inking a different load distribution of the color flow result in the inking unit. The inking unit is for a variety of Printing sujet more universally applicable, responsive and the existing Ink fountain rollers remain preferred - despite different Switch positions - always in the respective color flow.

outgoing from the distributor roller, the color flow to a Vorderlastig designed Inking unit, d. H. to the direction of rotation of the plate / forme cylinder at least first and preferably second, optionally third inking roller be supplied with a relatively high ink flow rate and the remaining reduced color flux content becomes the other, for example, third and fourth and possibly further, Supplied inking rollers.

alternative can from the distributor roller of the paint flow to a medium-sized designed Inking unit, d. H. to the direction of rotation of the plate / forme cylinder at least second and preferably third inking roller with a relatively high color flow rate are supplied and the remaining reduced color flow content will be the other, for example, first and fourth and optionally further, inking rollers supplied.

alternative can from the distributor roller of the paint flow to a hinterlastig designed Inking unit, d. H. to the direction of rotation of the plate / forme cylinder at least third and preferably fourth inking roller with a relatively high color flow rate are supplied and the remaining color flow component becomes the other, for example, first and second and optionally further, inking rollers supplied.

It is also advantageous that, in the event of a possible occurrence of stenciling phenomena during printing, the inking unit by switching operations of a distributor roller in a first and second sub-roller train downstream ink transport rollers, if necessary, inking rollers, the inking unit in universal working can be operated optionally. Thus, possible stencilling phenomena are avoidable or at least significantly reducible with a simultaneously stabilized color guide. In this case, the change of the ink flow can be carried out from the distributor roller according to the respective operation in the machine downtime and during the printing operation.

The Invention is intended to be closer to an embodiment be explained. Here are shown schematically:

1 an inking unit of an offset printing machine,

2 to 6 the inking unit in a single development.

According to 1 an inking unit for an offset printing machine is shown which, inter alia, a Farbdosier- / Zuführeinrichtung 10 includes. This Farbdosier- / feeder 10 may preferably be formed by a paint box with metering device and with ink fountain roller and a dye fountain roller or a film inking roller. The ink fountain roller or the film inking roller is preferably provided with a fourth inking roller 9 in active connection. The fourth inking roller 9 is at least one compactor in the direction of color flow 11 arranged downstream of several inking rollers, which form a first color flow. This first color flow is applied to a distributor roller arranged downstream of one of the ink transport rollers 8th transferred, this distributor roller 8th preferably as a third inking roller 8th can be trained.

As seen in the color flow direction, the further compactor splits at the distributor roller 8th and thus the color flow over two subordinate, designed as branch rollers ink transfer rollers 15 . 16 in a first and a second sub-roller train 12 . 13 and thus the color flow is divided into two partial color streams. Each of the sub-roller trains 12 . 13 may include multiple ink rollers as needed. The two partial color streams are at a direction of rotation of the plate / forme cylinder 1 front inking roller, here a second inking roller 3 , fed.

In the present example, the direction of rotation of a plate / forme cylinder 1 first part roller train 12 by the ink feed roller designed as a first branch roller 15 and one of these downstream, first inking roller 6 educated. About the inking roller 15 The first part of the ink stream is transferred to the first inking roller 6 and in the direction of rotation of the plate / forme cylinder 1 seen subsequent front (first two) inking rollers 2 . 3 supplied to the inking unit.

Furthermore, in the direction of rotation of the plate / forme cylinder 1 second part roller train 13 by the color transfer roller designed as a second branch roller 16 and one of these subordinate ink transfer rollers 17 educated. The ink transfer roller 17 is as a bridge roller with the front, second inking roller 3 and one in the direction of rotation of the plate / forme cylinder 1 downstream, third inking roller 4 in contact. The third inking roller 4 is in the direction of rotation of the plate / forme cylinder 1 a fourth inking roller 5 downstream, with both inking rollers 4 . 5 from a second inking roller 7 are bridged. About the inking roller 16 is thus on the color transport roller 17 the second partial ink flow on the two inking rollers 3 . 4 fed. From the third inking roller 4 is over the second ink roller 7 Paint on the fourth inking roller 5 fed.

From the inking rollers 2 to 5 the color is transferred to the plate / forme cylinder 1 fed. The plate / form cylinder 1 carries a fixable on the lateral surface printing form, for example as a printing plate or sleeve. Alternatively, on the lateral surface of the plate / forme cylinder 1 a printing form can be generated, fixed and preferably erasable. All inking rollers 6 to 9 are rotary and / or axially iridescent drivable. All inking rollers 2 to 5 are driven by friction and are formed on / off adjustable. If necessary, the inking rollers 2 to 5 be formed axially iridescent, the traversing movement is also stopped. The first, third and fourth inking rollers 2 . 4 and 5 If necessary, they can be used individually, in groups or as a whole 22 be assigned directly.

For wet offset printing can in the direction of rotation of the plate / forme cylinder 1 the inking unit a dampening unit 14 be upstream.

In addition to the two partial roller trains described at the beginning 12 . 13 splits seen in the direction of color flow of the further compactor on the distributor roller 8th in a third sub-roller train 21 , Thus, the color flow in addition to the two downstream, designed as a branch rollers ink transfer rollers 15 . 16 of the first and second sub-roller train 12 . 13 in a third sub-roller train 21 and thus the color flow is additionally divided into a third partial color flow. Each of the sub-roller trains 12 . 13 . 21 may include multiple ink rollers as needed. The two partial color streams 12 . 13 be in a direction of rotation of the plate / forme cylinder 1 front inking roller, here a second inking roller 3 , fed.

In the present example, the third sub-roller train 21 by at least one, as a third branch Roller executed inking roller 20 educated. This third part roller train 21 may also include multiple color transfer rollers. The third sub-train 21 and thus the third partial color flow is always the second Teilwalzenzug 13 before its inking rollers 4 . 5 supplied, wherein the third partial ink stream and individual inking rollers 4 . 5 can be supplied.

Starting from the in 1 Depending on the print job and / or the rheological conditions at the distributor roller, the basic version shown is 8th the color flow in addition to the first and second part color streams at a direction of rotation of the plate / forme cylinder 1 the second sub-train 13 downstream third Teilwalzenzug 21 divided up. In this case, the third partial color flow of the third sub-roller train 21 the second partial color flow of the second part roller train 13 before its inking rollers 4 . 5 fed. In the present example, the third sub-roller train 21 with the second part roller train 13 , especially the second inking roller 7 , in permanent contact.

In one embodiment, the color flow at the distributor roller 8th additionally at one in the direction of rotation of the plate / forme cylinder 1 the second sub-train 13 downstream third Teilwalzenzug 21 be split. The third partial color flow of the third sub-roller train 21 This is the second partial ink flow of the second partial roller train 13 before its inking rollers 4 . 5 fed.

In one embodiment, the second Teilwalzenzug 13 temporarily at a separation point 19 before the inking rollers 3 . 4 . 5 to be interrupted.

In a further embodiment, the second Teilwalzenzug 13 temporarily on one of the distributor roller 8th downstream separation point 19 to be interrupted. The ink transfer roller 16 of the second sub-roller train 13 is doing in the first part roller train 12 before its inking rollers 2 . 3 and the second sub-roller train 13 before its inking rollers 3 . 4 . 5 integrated.

In one embodiment, the inking roller 16 of the second sub-roller train 13 with the first inking roller 6 of the first sub-roller train 12 and the inking rollers 3 . 4 of the second sub-roller train 13 upstream color transport roller 17 temporarily be brought into contract.

In a further embodiment, the ink transport roller 16 of the second sub-roller train 13 temporarily in the first part roller train 12 before its inking rollers 2 . 3 to get integrated.

In a further embodiment, the second Teilwalzenzug 13 temporarily at a separation point 19 to be interrupted. The first and third sub-roller trains 12 ; 21 are with the distributor roller 8th in contact and the ink transfer roller 16 of the second sub-roller train 13 is with the distributor roller 8th and the first inking roller 6 of the first sub-roller train 12 temporarily in contact.

In a further embodiment, the first part roller train 12 temporarily on one of the distributor roller 8th downstream separation point 23 to be interrupted. The second and third sub-roller trains 13 . 21 remain with the distributor roller 8th in contact, so that the flow of color through the second and third partial ink flow to the inking rollers 2 to 5 can be realized.

Alternatively, that of the distributor roller 8th immediately adjacent ink transport roller 15 be removed from the inking, so that the first part of color flow (first Teilwalzenzug 12 ) can be interrupted.

In a further embodiment according to 5 becomes the second sub-roller train 13 tem porar at one of the distributor roller 8th downstream separation point 19 interrupted and a paint roller 16 of the second sub-roller train 13 will be in the first part roller train 12 before its inking rollers 2 . 3 integrated. Further, one is the inking rollers 3 . 4 upstream color transport roller 17 of the second sub-roller train 13 temporarily at a separation point 18 to the second inking roller 3 separated and with the third inking roller 4 staying in contact and a paint transport roller 20 of the third sub-roller train 21 brought into contact.

In a further embodiment according to 6 becomes the second sub-roller train 13 temporarily before a third inking roller 4 of the second sub-roller train 13 temporarily at a separation point 18 interrupted and the ink rollers 16 . 17 of the second sub-roller train 13 temporarily in the first part roller train 12 integrated, preferably before the inking rollers 2 . 3 of the first sub-roller train 12 integrated. In the present example, the ink transfer roller temporarily becomes 16 with the distributor roller 8th staying in contact with the first inking roller 6 brought into contact and the ink transfer roller 17 becomes temporary with the ink transfer roller 16 in contact with the second inking roller 3 brought into contact.

In the design of the inking according to 2 arise on the second inking roller 3 the highest ink flow rate and at the other inking rollers 2 . 4 . 5 approximately the same color flow rates.

In the design of the inking according to 3 arise at the first and second colors order-roller 2 and 3 Color flow shares of approximately 60%. The third inking roller 4 has a - based on the total ink flow rates of the two inking rollers 2 and 3 - By approximately 50% reduced color flow rate on. The fourth inking roller 5 has a slightly higher ink flow rate than the third inking roller 4 on.

In the design of the inking according to 1 arise on the second and third inking roller 3 . 4 Color flow shares totaling approximately 55%. The first inking roller 2 has a - based on the total ink flow rates of the two inking rollers 3 and 4 - By approximately 50% reduced color flow rate on. The fourth inking roller 5 has the least amount of color flow.

When designing the inking unit 4 The color flow components are the inking rollers via the second and third partial ink flow 2 to 5 fed. The inking unit is designed here in particular medium-heavy and hinterlastig.

After completion of the print job, alternatively also in the printing operation, the color flow can be adjusted to the basic version according to 1 be converted.

1

Plate / form cylinder

2

first Inking roller

3

second Inking roller

4

third Inking roller

5

fourth Inking roller

6

first Ink distributor roller

7

second Ink distributor roller

8th

distributing roller (third ink roller)

9

fourth Ink distributor roller

10

Dye dispensing / feed

11

drum compactor (first color flow)

12

first Partial roller train (first partial color flow)

13

second Partial roller train (second partial color flow)

14

dampening

15

Screened roller (first branch roller)

16

Screened roller (second branch roller)

17

Screened roller

18

separation point

19

separation point (second part color flow)

20

Screened roller (third branch roller)

21

third Partial roller train (third partial color flow)

22

smoothing roll

23

separation point (first partial color flow)

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 0280957 A2 [0002]
• - DE 10248517 A1 [0003]
• - EP 0741024 A2 [0003]

Claims (9)

A process for inking a printing form in a processing machine for substrates, with an inking unit and optionally a dampening unit and a printing plate having plate / forme cylinder, wherein the inking unit comprises a Farbdosier- and Farbzuführeinrichtung, at least one compactor and inking rollers for coloring the printing form and the color flow is supplied to a distributor roller, is split at the distributor roller by means of two sub-roller trains in two sub-color streams and the two sub-color streams are fed to a front in the direction of rotation of the plate / forme inking roller, characterized in that the ink flow at the distributor roller ( 8th ) in addition in a direction of rotation of the plate / forme cylinder ( 1 ) the second sub-roller train ( 13 ) subordinate third sub-train ( 21 ) and the third partial color flow of the third sub-roller train ( 21 ) the second partial ink flow of the second part roller train ( 13 ) in front of its inking rollers ( 4 . 5 ) is supplied. A method according to claim 1, characterized in that the second partial roller train ( 13 ) temporarily at a separation point ( 19 ) in front of the inking rollers ( 3 . 4 . 5 ) is interrupted. A method according to claim 1, characterized in that the second partial roller train ( 13 ) temporarily on one of the distributor roller ( 8th ) downstream separation point ( 19 ) is interrupted and a Farbtransportwalze ( 16 ) of the second sub-roller train ( 13 ) in the first partial train ( 12 ) in front of its inking rollers ( 2 . 3 ) and the second sub-roller train ( 13 ) in front of its inking rollers ( 3 . 4 . 5 ) is integrated. Method according to Claim 3, characterized in that the ink-transporting roller ( 16 ) of the second sub-roller train ( 13 ) with the first inking roller ( 6 ) of the first part roller train ( 12 ) and the inking rollers ( 3 . 4 ) of the second sub-roller train ( 13 ) upstream inking roller ( 17 ) is temporarily brought into contract. Method according to Claim 1, characterized in that the ink-transporting roller ( 16 ) of the second sub-roller train ( 13 ) temporarily into the first partial train ( 12 ) in front of its inking rollers ( 2 . 3 ) is integrated. A method according to claim 1, characterized in that the second partial roller train ( 13 ) temporarily at a separation point ( 19 ), the first and third sub-trains ( 12 ; 21 ) with the distributor roller ( 8th ) are in contact and the inking roller ( 16 ) of the second sub-roller train ( 13 ) with the distributor roller ( 8th ) and the first inking roller ( 6 ) of the first part roller train ( 12 ) is in contact. Method according to claim 1, characterized in that the first partial rolling train ( 12 ) temporarily on one of the distributor roller ( 8th ) downstream separation point ( 23 ) is interrupted. A method according to claim 1, characterized in that the second partial roller train ( 13 ) temporarily on one of the distributor roller ( 8th ) downstream separation point ( 19 ) is interrupted and a paint transport roller ( 16 ) of the second sub-roller train ( 13 ) in the first partial train ( 12 ) in front of its inking rollers ( 2 . 3 ) and one of the inking rollers ( 3 . 4 ) upstream color transport roller ( 17 ) of the second sub-roller train ( 13 ) temporarily at a separation point ( 18 ) to the inking roller ( 3 ) and with the inking roller ( 4 ) and a color transport roller ( 20 ) of the third sub-roller train ( 21 ) is brought into contact. A method according to claim 1, characterized in that the second partial roller train ( 13 ) temporarily before an inking roller ( 4 ) of the second sub-roller train ( 13 ) temporarily at a separation point ( 18 ) and the ink transfer rollers ( 16 . 17 ) temporarily into the first partial train ( 12 ) integrated in front of the inking rollers ( 2 . 3 ) of the first part roller train ( 12 ) to get integrated.